docs: def set_pixel(self, x, y, value):
          """Set pixel at position x, y to the given value.  X and Y should be values
          of 0 to 7 and 0 to 15, resp.  Value should be 0 for off and non-zero for on.
          """
          if x < 0 or x > 7 or y < 0 or y > 15:
              # Ignore out of bounds pixels.
              return
          self.set_led((7 - x) * 16 + y, value)